Halogenated phenylalkane phosphonyl chlorides



HALOGENATED PHENYLALKANE PHOSPHONYL CHLORIDES Warren Jensen, Ponca City, Okla., and James 0. Clayton,

Berkeley, Calif., assignors to California Research Corporation, San Francisco, Calili, a corporation of Dataware No Drawing. Application July 6, 1954, Serial No. 441,666

2 Claims. (Cl. 260-543) This invention relates to new phosphorus-containing compounds, in particular, halogenated phenylalkane phosphonyl dichlorides.

This application is a continuation-impart of U. S. Patent 2,683,169 (filed June 11, 1952) and U. S. Patent 2,683,168 (filed December 22, 1950). This latter application is a continuation-in-part of application Serial No. 86,856 (filed April 11, 1949, and which has been abandoned), which in turn was a continuation-in-part of application Serial No. 716,182 (filed December 12, 1946, and which has been abandoned).

Phosphonyl chlorides and their derivatives are useful in various arts. For example, certain phosphonyl chloride derivatives (e. g., phosphonic acids and salts and esters thereof) are useful as lubricating oil additives, fire retardants, and textile treating agents; others are useful in the preparation of wetting agents, emulsifying agents, plasticizers, dispersing agents; and still others are useful as antistripping agents for asphalt paving compositions, asphalt pipe-coating compositions, etc.

The particular class of new compounds of this invention is useful as intermediates in the manufacture of insecticides, anti-preignition agents in gasolines, intermediates for pesticides, etc.

It is a primary object of this invention to set forth new phosphorus-containing compounds.

We have discovered halogenated phenylalkane phosphonyl chlorides, which are new compounds having unique properties. These new compounds, which are organophosphorus compounds, have at least one aliphatic carbon atom between the phosphorus atom and the phenyl nucleus. The phenyl' nucleus itself may have more than one halogen atom substituted thereon and, in addition, have alkyl substituents attached to the ring. These alkyl substituents in turn may also be bonded to a phosphorus atom in the formation of compounds having more than one phosphonyl radical.

Examples of these new compounds include the followmg:

l-o-chlorophenyl methane phosphonyl dichloride, l-m-chlorophenyl methane phosphonyl dichloride, 1-p-chlorophenyl methane phosphonyl dichloride, l-o-chlorophenyl ethane phosphonyl dichloride, 1-m-chlorophenyl ethane phosphonyl dichloride, l-p-chlorophenyl ethane phosphonyl dichloride, l-o-bromophenyl methane phosphonyl dichloride, l-m-bromophenyl methane phosphonyl dichloride, l-p-bromophenyl methane phosphonyl dichloride, l-o-bromophenyl ethane phosphonyl dichloride, l-m-bromophenyl ethane phosphonyl dichloride, l-p-bromophenyl ethane phosphonyl dichloride, 2-methyl-4-chlorophenyl methane phosphonyl dichloride, 3-methyl-4-chlorophenyl methane phosphonyl dichloride, 2,3-dirnethyl-4-chlorophenyl methane phosphonyl dichloride, 2,5-dimethyl-4-chlorophenyl methane phosphonyl dichloride,

Patented June 11, 1957 2 2,6-dimethyl-4-chlorophenyl methane phosphonyl dichloride, 2-methyl-4-chlcrophenyl ethane phosphonyl dichloride, 3-methyl-4-chlorophenyl ethane phosphonyl dichloride, 2,3-dimethyl-4-chlorophenyl ethane phosphonyl dichloride,

2,5-dimethyl-4-chlorophenyl ethane phosphonyl dichloride,

2,6-dimethyl-4-chlorophenyl ethane phosphonyl dichloride,

2-methyl-4-bromophenyl methane phosphonyl dichloride,

3-methyl-4-bromophenyl methane phosphonyl dichloride,

2,3-dimethyl-4-bromophenyl methane phosphonyl dichloride,

2,5-dimethyl-4-bromopl1enyl methane phosphonyl dichloride,

2,6-dimethyl-4-bromopheny-l methane phosphonyl dichloride,

2-methyl-4-bromophenyl ethane phosphonyl dichloride,

3-methyl-4-bromophenyl ethane phosphonyl dichloride,

2,3-dimethyl-4-bromophenyl ethane phosphonyl dichloride,

2,5-dimethyl-4-bromophenyl ethane phosphonyl dichloride, 2,6-dimethyl-4-bromophenyl ethane phosphonyl dichloride, 2,3-dichlorophenyl methane phosphonyl dichloride, 2,4-dichlorophenyl methane phosphonyl dichloride, 2,5-dichlorophenyl methane phosphonyl dichloride, 2,6-dichlorophenyl methane phosphonyl dichloride, 2,3,4-trichlorophenyl methane phosphonyl dichloride, 2,3-dichlorophenyl ethane phosphonyl dichloride, 2,4-dichlorophenyl ethane phosphonyl dichloride, 2,5-dichlorophenyl ethane phosphonyl dichloride, 2,6-dichlorophenyl ethane phosphonyl dichloride, 2,3,4-trichlorophenyl ethane phosphonyl dichloride, 2,3-dibromophenyl methane phosphonyl dichloride, 2,4-dibromophenyl methane phosphonyl dichloride, 2,5-dibromophenyl methane phosphonyl dichloride, 2,6-dibromophenyl methane phosphonyl dichloride, 2,3,4-tribromophenyl methane phosphonyl dichloride, 2,3-dibromophenyl ethane phosphonyl dichloride, 2,4-dibromophenyl ethane phosphonyl dichloride, 2,5-dibromophenyl ethane phosphonyl dichloride, 2,6-dibromophenyl ethane phosphonyl dichloride, 2,3,4-tribromophenyl ethane phosphonyl dichloride, 4-chloro-l,2-di(phenyl methane phosphonyl dichloride), 4-chloro-1,3-di(phenyl methane phosphonyl dichloride), 4-chloro-1,2,3,-tri(phenyl methane phosphonyl dichloride), 4-chl0ro-1,2,5-tri(phenyl ride), 4-chloro-1,2,6-tri(phenyl ride), 4-chloro-1,3,4-tri(phenyl ride), 4-chloro-1,3,6-tri(phenyl ride), 4-bromo-1,2-di(phenyl methane phosphonyl dichloride), 4-bromo-1,3-di(phenyl methane phosphonyl dichloride), 4-br0mo-1,2,3-tri(phenyl methane phosphonyl dichloride), 4-bromo-1,2,5-tri(phenyl ride), 4-bromo-1,2,6-tri(phenyl ride), 4-bromo-l,3,4-tri(phenyl ride), 4-bromo-l,3,6-tr i(phenyl ride), Other organic compounds which contain carbon-tophosphorus bonds include those derived from cycloalimethane phosphonyl dichlomethane phosphonyl dichlomethane phosphonyl dichlomethane phosphonyl dichlomethane phosphonyl dichlomethane phosphonyl dichlomethane phosphonyl dichlomethane phosphonyl dichloas chlorinated hydrocarbons, ethers, esters, ketones, etc,

and unsaturated hydrocarbons, such as butene-1, isobutene-l, octene-l, isooctene-l, cetene, olefin polymers, etc., may be reacted.

Further examples of organic compounds which may be reacted with phosphorus trichloride and oxygen include ethyl chloride, ethyl fluoride, ethyl bromide, propyl chloride, propyl fluoride, propyl bromide, amyl chloride, dodecyl chloride, cetyl chloride, cetyl bromide, chlorinated petroleum. wax, dichloropentane, p-chlorotoluene, p-chlorophenyl ethane, cyclohexyl chloride, diethyl ether, monochlorodiethyl ether, methyl n-butyl ether, isoamyl benzyl ether, anisole, veratrole, phentole, hydroquinone diethyl ether, tetrahydrofurane, tetrahydropyrane, hexamethyl sorbitol, dibutoxytetraglycol, propyl butyrate, ethyl stearate, isobutyl phthalate, ethyl-naphthyl acetate, hexyl benzoate, amyl acetate, amyl laurate, diamyl oxalate, di(2-ethyl-hexyl) phthalate, dioctyl sebacate, glycol laurate, cetyl. palmitate, tristearin, trioctyl phosphate and n-amyl benzene sulfonate.

Examples of other phosphonyl compounds include: propane phosphonyl chloride, pentane phosphonyl chloride, hexane phosphonyl chloride, decane phosphonyl chloride, cetane phosphonyl chloride, dodecane phosphonyl chloride, butene phosphonyl chloride, hexene phosphonyl chloride, isobutane phosphonyl chloride, isobntene phosphonyl chloride, cyclohexane phosphonyl chloride, diethyl cyclohexane phosphonyl chloride, cetyl cyclohexane phosphonylv chloride, chlorohexane phosphonyl chloride, chlorodecane phosphonyl chloride, methyl-amyl ketone' phosphonyl chloride, propylhexyl ketone phosphonyl chloride, phenylmethyl phosphonyl chloride, phenylhexanephosphonyl chloride, phenylcetane phosphonyl chloride, petroleum wax phosphonyl chloride, propylbutyrate phosphonyl chloride, ethylstearate phosphonyl chloride, isobutyl phthalate phosphonylv chloride, amyl acetate phosphonyl chloride, dioctyl sebacate phosphonyl chloride, trioctyl phosphate phosphonyl chloride, diethyl ether phosphonyl chloride, monochlordiethyl ether phosphonyl chloride, etc.

A method of preparing these new compounds includes the reaction of a halogenated alkane with phosphorus trichloride in thepresence of oxygen. This particular method is presented in the fOllOWing equation:

wherein RH represents a halogenated phenyl alkane.

This reaction may be carried out in the gaseous or liquid phase, the temperature varying from elevated temperatures to subzero temperatures. However, it is preferred to operate well below cracking temperature of the cycloalkane reactant. The most advantageous range of temperature is about -70 C. to about +75 C.

. The proportions of reactants may be varied considerably. As the molar ratio of phosphorus trichloride to cycloalkane is increased, the yield of the phosphonyl dichloride, based on the cycloalkane charged, increases.

The rate of addition of oxygen does not appear to-afiect the yieldor purity, but as the rate of oxygen input is ingasoline,

creased, evolution of heat also increases and more cooling is usually necessary. It is preferred to use an excess of oxygen, but it is also generally beneficial to use such an amount as will permit maintaining the reaction temperature between 0 C. and 75 C.

The physical conditions under which the reaction is carried out will depend to a considerable degree upon the nature of the reactants. Thus, phosphorus trichloride is relatively volatile (boiling point, 76 C.), hence, unless pressure is used or unless a recovery system for vaporized phosphorus trichloride is used, the reaction temperature will be kept below 76 C. Where a volatile hydrocarbon reactant, such as propane or butane, is employed, it may be necessary to use a pressure system for the reactants. Similarly, if the reaction is made at a temperature above that of the boiling point of phosphorus trichloride (76 C.), it may be necessary to use a pressure system.

Phosphonyl dichlorides may be treated with water to produce the corresponding phosphonic acids byhydrolysis. Where the resulting phosphonic acids are water soluble, they may be extracted with water. Where the phosphonic acids produced by hydrolysis are water insoluble, the reaction mixture may be extracted with an aqueous alcoholic solution of caustic alkali, and the alkaline extract acidified to precipitate the free acids.

Phosphonic acid may be reacted with basic substances to form the corresponding salts. For example, the phosphonic acids may be reacted with sodium hydroxide to prepare the sodium salts of the phosphonic acids. Other metal salts which may be prepared include potassium, lithium, selenium, calcium, barium, zinc, aluminum, lead, etc.

The new compounds of this invention are preferably prepared by bubbling oxygen through a mixture of a halogenated phenylalkane and phosphorus trichloride while the temperature is maintained at 55 C. to 60 C. Unreacted halogenated phenylalkane and the by-product, phosphorus oxychloride, are removed from the reaction mixture by distillation at reduced pressure. The crude organophosphonyl chloride is then distilled off and purified further by redistillation. The specific examples set forth hereinbelow will serve further to illustrate the practice and advantages of this invention.

Example I.-Preparation of p-chlorophenyl methane phosphonic acid A mixture of 44.4 parts by weight of p-chlorotoluenc and 240 parts by weight of phosphorus trichloride was placed in a glass apparatus, and oxygen was bubbled through this mixture at 55 to 60 C. until the reaction was complete. After the reaction with oxygen, the whole reaction mixture was slowly poured into 2000 parts by weight of distilled water to hydrolyze the phosphonyl chloride. After three hours of vigorous stirring,

' the reaction mixture was extracted with hexane, then further extracted with ethyl ether. The ether extract resulted in the recovery of a light brown solid having a melting point ranging from 302 to 310 F. The ether extract product contained 11.58% phosphorus (theory: 15.0%) and 16.4% chlorine (theory=17.18%). The pKi and pKz values were, respectively, 4.5 and 9.25.

The hexane extract, after removal of the hexane, consisted essentially of unreacted p-chlorotoluene.

' Example II.Preparation of chlorohexane phosphonic acid rately with hexane, ethyl ether and benzene. The product recovered from the ether extract contained 15.8% phosphorus (theory=15.5). The PK]. and pKz values were, respectively, 4.4 and 9.0. The hexane extract product was a dark, viscous oil, the ether extract product was a dark brown viscous oil, and the benzene extract product was a brown viscous oil.

Example III.-Preparatin of cyclohexane phosphonyl chloride and cyclohexane phosphonic acid 6.5 parts by weight of phosphorus trichloride and 1 part by weight of cyclohexane (molar ratio of PC13 to cyclohexane of 4) were mixed together at room temperature and placed in a glass cylinder having a sintered glass bubbling plate at the bottom and fitted with a condenser and a thermometer. When oxygen was bubbled into the solution of cyclohexane and phosphorus trichloride, the temperature quickly rose to 60 C. .By means of a water bath, the temperature during the reaction was maintained between 55 to 60 C. The oxygen bubbling was continued until the exothermic effect ended and the temperature returned to room temperature. The reaction mix was first distilled under vacuum to distill off the cyclohexane, the POCls, and the crude cyclohexane phosphonyl chloride. The crude cyclohexane phosphonyl chloride was then distilled at reduced pressure to obtain the pure cyclohexane phosphonyl chloride, which distilled over at temperatures ranging from 127 to 128 C. and an absolute pressure of 15 mm. of mercury. The following analytical data were obtained on a pure sample which crystallized on standing:

Found Calculated for CsHnPOOh P, percent"; 15.1,15.1 15.4 01, percent 33.9, 33.4 35.3 Melting Point,0 37.0-37.5

A sample of the above cyclohexane phosphonyl chloride was hydrolyzed with water. The water solution was concentrated to one-fourth its volume and cooled, whereupon colorless needles separated out. The following analytical data were obtained on these crystals:

Found Calculated for OsHnPO(OH) P, percent 18.7, 18.8 18.9 Equivalent wt. (g.) 82 82 Melting Point, C 166-167 Example IV.Preparati0n 0f heptane phosphonyl chloride and heptane phosphonic acid Found Calculated for C1H15POC1:

P, percent 14. 5, 14. 5 14. 3 Cl, percent 32. 7, 33.0 32. 7

The heptane phosphonyl chloride was hydrolyzed with water to give a colorless, viscous liquid. The following analytical data were obtained on this heptane phosphonic acid:

Found Caleulated for P, percent 16. 8, 16.9 17. 2 Equivalent wt. (g.) 89. 5 90. 0

Example V.Preparation of methylpeniane phosplzonyl chloride and methylpentane phosphonic acid A mixture of 7.9 parts by weight of phosphorus trichloride and 1 part by weight of 3-methylpentane (molar ratio of PC13 to 3-methylpentane of 4) was placed in the same glass apparatus described in Example 111. Oxygen was bubbled through this mix at 55-60 C. until the reaction was complete. The following analytical data were obtained on the distilled methylpentane phosphonyl chloride and on the methylpentane phosphonic acid resulting from the hydrolysis of the chloride with Water:

Example VI.-Preparati0n of petroleum white oil phosphonyl chloride A mixture of 4.1 parts of phosphorus trichloride and 3 parts by weight of petroleum white oil 1 (molar ratio of PC13 to white oil of 5) was placed in the same glass apparatus described in Example Ill. Air was bubbled through the mix at a temperature range of 55-60 C. until the reaction was complete. This product was then hydrolyzed with water to the phosphonic acid, which was shown by the analytical data to contain 5.2% phosphorus; the calculated value for one phosphorus atom per molecule is 5.3% phosphorus.

Example VII.-Preparation of phenyloctadecane phosphonyl chloride and phenyloctadecane phosphonic acid A mixture of 1.7 parts by weight of phosphorus trichloride and 1 part by weight of octadecylbenzene was placed in the usual glass apparatus. Oxygen was bubbled through this mix at 55 to 60 C. until the reaction was complete. The phenyloctadecane phosphonyl chloride was hydrolyzed to the phenyloctadecane phosphonic acid.

Example VlIl.Preparati0n of zetrahydr naphthalene- (1,2,3,4)-ph0sph0nyl chloride and tetrahydronaphthalene (1,2,3,4)-ph0sphonic acid A mixture of 4.2 parts by weight of phosphorus trichloride and 1 part by weight of tetrahydronaphthalene (1,2,3,4) was placed in the above-described glass apparatus. Oxygen was bubbled through this mix at 55 to 60 C. until the reaction was complete. The resulting tetrahydronaphthalene(l,2,3,4)-phosphonyl chloride was hydrolyzed to the tetrahydronaphthalene(l,2,3,4)-phosphonyl chloride was hydrolyzed to the tetrahydronaphtha1ene( l,2,3,4)- phosphonic acid.

Example IX.Preparati0n of sulfurized calcium petroleum white oil phosphonate A mixture of 100 parts by weight of calcium petroleum white oil phosphonate and 13 parts by weight flowers 1 The petroleum white 011 had an average molecular weight of 500, a nephthene content of 20%, and a parafiin content of of sulfur was added to a reactionvessel and stirred vigorously at 146165 C. for 4 hours. The mixture was cooled to 25 C. and extracted with petroleum ether. The mixture was. filtered to remove unreacted sulfur. This extraction with petroleum ether was repeated several times. The petroleum ether was then removed by heating the mixture on a steam plate. The product contained 2.44% calcium, 1.78% phosphorus, and 2.59% sulfur.

Example X.Preparation of sulfurized calcium petroleum white oil phosphonate A mixture of 312 parts by weight of petroleum white oil phosphonyl, chloride, 51 parts by weight of sulfur dichloride and 120 parts by weight of carbon tetrachloride was placed in a reaction vessel and heated at reflux tempertaure (-with stirring): for 10 hours. The unreactcd sulfur dichloride and the carbon tetrachloride were removed by distillation at reduced pressure.

Then a mixture of 75 parts by weight of the above sulfurized petroleum white oil phosphonyl chloride, parts by weight of calcium hydroxide, parts by weight of 95% ethyl alcohol and 90 parts by weight of benzene was placed in a reaction flask and heated at reflux temperature for 5 hours. The unreacted calcium hydroxide was removed by filtration. After the alcohol and benzene had been removed by distillation, the product contained 2.27% calcium, 1.71% phosphorus and 0.98% sulfur.

Example Xl.Preparation of sulfurized calcium petroleum white oil phasph nate A mixture of 145 parts by weight of. petroleum white oil phosphonic acid, 26 parts by weight of sulfur dichloride and 120 parts by weight of carbon tetrachloride was laced in a reaction vessel and heated (with stirring) at reflux temperature for 7 hours. Unreacted sulfur dichloride and the carbon tetrachloride were removed by distillation at reduced pressure.

Then a mixture of 60 parts by weight of the above sulfurized petroleum white oil phosphonic acid, 25 parts by weight of calcium hydroxide, 40 parts by weight of 95% ethyl alcohol and 315 parts by weight of benzene was heated at reflux temperature for 5 hours. The unreacted calcium hydroxide was removed by filtration, and the alcohol and benzene were removed by distillation. The product contained 2.35% calcium, 1.58% phosphorus and 2.70% sulfur.

Example X1I.Preparati0n of the phosphonic acid derivative of diamyl' ether A mixture of 55.5 parts by weight of diamyl ether and 240 parts by weight of phosphorus trichloride was placed in the usual glass apparatus. Oxygen was bubbled through this mix at to C. until the reaction was complete. The resulting phosphonyl chloride was hydrolyzed to the phosphonic acid. The hydrolyzed product was extracted first with hexane and then with ethyl ether. The reaction products recovered after the solvents had been removed by heating were, in both cases, dark viscous oils. No attempt was made to purify these reaction products.

The analysis of the products of the reaction was as follows:

Percent Phosphorus Extract pKr pKr Found Theory Hexane 9. 97 13.0 4. 9 10. 25 Ether Extract 14. 38 13. 0 4. 4 9. 35

The PK! and PK: values for phosphonic acids are Example XIII..Preparati0n of the phosphonic acid derivative of methyl-n-amyl ketone A mixture of 35.5 parts by Weight of rnethyl-n-amyl ketoneand 213 parts by weight of phosphorus trichloride was placed in the usual glass apparatus. Oxygen was bubbled through this mixture at 55 to 60 C. until the reaction was believed to be complete. The resulting phosphonyl chloride was hydrolyzed to the phosphonic acid, and the hydrolysis product was extracted separately with hexane and ethyl ether. The product recovered from the hexane extract was a light brown liquid and the product recovered from the ether extract was a dark viscous liquid. The ether extracted product, which was not purified, contained 12% phosphorus (theory: 6% P). The pKi and pKz values were, respectively, 4.9 and 10.1.

After the phosphonic acid reaction mixture had been extracted with hexane and ethyl ether, the residual aqueous layer was then extracted with ethyl ether and ethyl alcohol. The products recovered from the ethyl ether and alcohol extracts had the following analysis:

Example X I V.-Preparati0n of chlcrohexane phosphonic acid A mixture of 42.3 parts by weight of n-hexyl chloride and 241 parts by weight of phosphorus trichloride was placed in the usual glass apparatus. Oxygen was bubbled through this mixture at 55 to 60 C. until the reaction was complete. The chlorohexane phosphonyl chloride was hydrolyzed to the chlorohexane phosphonic acid. The chlorohexane phosphonic acid reaction mixture was extracted separately with hexane, ethyl ether and benzene. The product recovered from the ether extract contained 15.8% phosphorus (theory=l5.5). The K and pKz values were, respectively, 4.4 and 9.0.

The hexane extract product was a dark viscous oil, the ether extract product was a dark brown viscous oil, and the benzene extract product was a brown viscous oil.

Example XV.-The reaction of isoamyl valerate with phosphorus trichloride in the presence of oxygen A mixture of 18 parts by weight of isoarnyl valerate and 71 parts by weight of phosphorus trichloride was blended together in the usual glass apparatus. Oxygen was bubbled through the mixture at temperatures ranging from 50 to 60 C. until the reaction was complete. The reaction mixture resulting therefrom was hydrolyzed and extracted with hexane first and then with ethyl ether. The ether extract yielded a dibasic acid having the properties of a phosphonic acid. The pKi value of this reaction product was 4.7, and the pKz value was 9.2. There was evidence of splitting of the ester accompanying the phosphonation reaction.

Example XVL-Preparation 0] phenylmethane phosphonic acid A mixture of 92 parts by weight of toluene and 137 parts by weight of phosphorus trichloride was placed in the usual glass apparatus. Oxygen was bubbled through the mixture at 55 to 60 C. until the reaction was complete. After the reaction with oxygen, the phosphorus oxychloride was distilled off under reduced pressure. The remaining dark brown viscous tarry residue was hydrolyzed and extracted twice with hot water. T he reaction product was recrystallized in water, yielding a light tan crystalline solid having a melting point range of 128 to 138 C. This product contained 19.3% phosphorus (theory=l8.02), and the molecular weight was found to be 160.8 (theory=172).

Example XVII.-Preparation of a trichlorethane phasphonie acid A mixture of 44 parts by weight of methyl chloroform and 227 parts by weight of phosphorus trichloride was placed in a glass apparatus. Oxygen was bubbled through this mixture at 55 to 60 C. until the reaction was believed to be complete. This reaction mixture -was slowly poured into water, then extracted with ethyl ether. The product recoveredfrom the ether extract was a light brown solid containing 7.04% phosphorus (theory: 13.4%) and having 2. pk. value of 5.3.

Example XVIII.Preparatin of phenyt' polypr0penc phosphonyl chloride and phosphonic acid A polypropene benzene was prepared by polymerizing propylene, then reacting this polyproprene with benzene, using HF as the alkylating catalyst. The average molecular :weight of this polypropene benzene was 263.

A mixture of 66 parts by weight of this polypropene benzene and 137 parts by weight of phosphorus trichloride was placed in a glass vessel, and oxygen was bubbled through the mixture. The resulting phenyl polypropene phosphonyl chloride was hydrolized :to iorrn the corresponding phosphonic acid. The reaction product (not purified) contained 4.6% phosphorus (:theory=9.0%).

Example X1X.Preparati0n of anisole phosphonic acid A mixture of 35.8 parts by weight of .anisole and 227 parts by Weight phosphorus trichl-oride was placed in a glass apparatus. Oxygen was bubbled through the mixture at 55 to 60 C. until the reaction was complete. The resulting phosphonyl chloride mixture was hydrolyzed, then extracted with ethyl ether. The product recovered from the ethyl ether extract was a yellow crystalline material containing 9.42% phosphorus and having a pKr value of 4.2. The analysis of the reaction product here was difiicult, due to the low solubility of the phosphonic acid in organic solvents. The phosphonic acid was extremely soluble inwater.

:The phosphonyl chlorides and the phosphonic acids prepared according to the methods of this invention are useful as intermediates in subsequent preparations. Now, because of the above satisfactory method of preparing phosphonyl chlorides and phosphonic acids, it is possible to use the phosphonyl chlorides and phosphonic acids as intermediates in the preparation of other groups of compounds, some of which are new compounds. Such compounds .as noted hereinbelow may be prepared from phosphonyl intermediates.

Various esters of phosphonic acids are prepared by reacting phosphonic acids with esterifyin-g groups. For ex-- ample, alkyl esters of phosphonic acids are prepared by reacting alkanephosphonyl chlorides with alcohols, as exemplified by the following equation:

wherein R represents the hydrocarbon structure of the phosphonyl chloride molecule and R is the hydrocarbon group of the alcohol. The phosphonic acid esters usually are effective as wetting agents, detergents, plasticizers, etc.

Alcohols which may be used include methyl alcohol, ethyl alcohol, propyl alcohol, butyl alcohol, nonyl alcohol, monoesters of dihydric alcohols (e. g., glycol monoacetate), diesters of ltrihydric alcohols (e. g., soybean oil fatty acid diglyceride), etc.

The following examples illustrate the method of obtaining esters of phosphonic acids by reacting phosphonyl chloride with aliphatic alcohols according to Equation 1.

Example XX.-Dimethyl ester of dodecane phosphonic acid Thirty grams of dodecane phosphonyl chloride were added gradually to a solution of 8 grams of methyl alcohol in 30 grams of pyridine, on a steam bath for minutes, cooled to room temperature, then diluted with 15 grams of water. This mixture was then acidified with hydrochloric acid. The resulting oily upper phase was extracted with grams of ethyl ether, then treated with grams of a 5 percent (by weight) water solution of sodium sulfate, followed by a subsequent washing with 25 grams of a 5 percent (by weight) water solution of sodium bicarbonate. The ether solution was dried, and the ether removed by evaporation. The resulting ester was almost a colorless oil containing 11.2% phosphorus. The theoretical value for the phosphorus content of the dimethyl ester of dodeoane phosphonic acid is 11.1%.

Example XXL-Dibutyl ester of cyclohexane phosphonic acid Twenty grams of cyclohexane phosphonyl chloride were added gradually to a solution of 18 grams of n-butyl alcohol in grams of pyridine. This imixuirewas heated and treated the same as that of Example XX to isolate a colorless oil containing 11.1 percent by weight of phosphorus. The theoretical value of the phosphorus content of the ester is 11.2%.

Example XXII.--Preparati0n of soybean oil fatty acid ester of cyclohexane phosphonyl chloride A mixture of 1 part by weight of cyclohexane phosphonyl chloride .and 5 parts by weight of carbon tetrachloride was placed in a flask and stirred. During the stirring, a mixture of 7.2 parts by weight of soybean oil fatty acid diglyceride and 1 part by Weight of pyridine was added slowly at room temperature. This mixture was slowly heated to reflux temperature, and maintained at that temperature for almost 6 hours. The mixture was then washed free of pyridine and pyridine hydrochloride and 'dried. The carbon tetrachloride was removed by evaporation, using the steam plate. The product contained 2.17% phosphorus; the theoretical value being 2.28%.

Oxyalkylene esters of alkanephosphonic acids are prepared by reacting at least 2 mols of an oxyalkylene compound, for example, an olefin oxide (e. g., ethylene oxide, propylene oxide and butylene oxide) with one mol of an alkanephosphonic acid. This reaction is exemplified by the following equation:

wherein n is an integer of 1 to 10, R represents the hydrocarbon structure of the phosphonic acid, and R and R represent hydrogen and alkyl groups.

By the term oxyalkylene we mean the divalent radical (CRR)nO, wherein n is a whole number of greater than 2; the R and R" may be the same or different, and are selected from the group consisting of hydrogen and alkyl groups.

In addition to using the method represented by the above Equation 2, esters of long-chain phosphonic acids are prepared by reacting long-chain allranephosphonyl dichlorides with compounds containing a terminal hydroxyl group, for example, monoalkyl ethers of glycols, in the presence of a substance capable of neutralizing the hydrochloric acid formed during the reaction, such as an amine, pyridine, other nitrogen bases and other alkaline substances. Monoallryl ethers of glycols include the monoalkyl ethers of ethylene glycol, triethylene glycol, other polyethylene glycols, propylene glycols, butylene glycols, trimethylene glycols and tetramethylene glycols; for example, 2rnethoxyethanol, 2-ethoxyethanol, 2-

This mixture was heated RI RI! wherein R represents the hydrocarbon structure of the phosphonyl chloride, R and R are alkyl groups or hydrogen atoms, R is an alkyl group, and x is an integer of l to 5.

The following examples illustrate the preparation of the esters of phosphonic acid according to Equation 3:

Example XXIII.-Octadecane phosphonic acid ester of the molzomethyl ether of ethylene glycol To a mixture of 17 parts by weight of the monomethyl ether of ethylene glycol and 30 parts by weight of pyridine was gradually added 37.1 parts by weight of octadecane phosphonyl chloride. The mixture was allowed to stand at. room temperature for minutes, then warmed on a steam bath for 20 minutes. The reaction mixture was cooled, diluted with 10 parts of water and acidified with HCl. The upper oily layer was extracted with parts of ether and washed with 50 parts of a half-saturated solution of sodium sulfate. The ethereal extract was dried and the solvent was evaporated to give a light-colored oil which was very slightly soluble in water. The material possessed the formula:

O1SH37P(OCH2CH2OCH3)2 Analysis of the ester:

Theory, Found, percent percent Phosphorus Content 6. 90 7. 36

Example XX 1 V.2VI onobutyl ether of diethylene glycol ester of zefradecane phosphonic acid Analysis of the ester:

Theory, Found, percent percent Phosphorus Content 5. 48 5.22

Example XXV.Triethylene glycol ester of octadecane phosphonic acid To a mixture of 37.5 parts by weight of triethylene glycol and parts by weight of pyridine was gradually added 37.1 parts by weight of octadecane phosphonyl chloride. The ester product was obtained in the same manner as that outlined in Example XXVIII. The prod- R1G[O(CE on c u +21ro 12 not was a thick syrupy liquid'which had the following formula:

Analysis of the product:

Theory, Found, percent percent Phosphorus Content 5. 2 5. 6

Example XX Vl.Ethylene glycol ester of n-hexadecane phosphonic acid parts by weight of n-hexadecane phosphonic acid were treated portionwise with 30 parts by weight of ethylene oxidev The reaction mixture was allowed to warm to 35 C., at which temperature it was maintained for 30 minutes. The excess ethylene oxide was removed by warming the reaction mixture under reduced pressure to C. The product had the formula:

Example XX VII.-Pentaethylene glycol ester of n-octadecane phosphonic acid The straw-colored liquid contained 4.0% phosphorus. The theoretical phosphorus value is 3.9%.

Example XXVIIl.Preparati0n 0f di(diethylene glycol monoethyl ether) petroleum white oil phosphonate A mixture of 1 part by weight of the monoethyl ether of diethylene glycol and 1 part by weight of pyridine was placed in a glass reaction vessel. To this mixture was slowly added 1.8 parts by weight of the petroleum white oil phosphonyl chloride of above Example VI. By cooling means, the temperature was kept at about room temperature until all of the white oil had been added. The whole mixture was then heated on a steam bath for 20 minutes, cooled to room temperature, acidified with concentrated hydrochloric acid and washed with water. The ester was extracted with petroleum ether. The petroleum ether solution was dried, then heated on a steam plate to remove the petroleum ether, thereby obtaining the desired phosphonate, which was a viscous liquid.

The following esters are representative of the esters which were prepared of dodecane phosphonic acid, tetradecgne phosphonic acid, and hexadecane phosphonic aei Di-(ethylene glycol) ester Di- (diethylene glycol) ester Di-(triethylene glycol) ester Di-(polyethylene glycol) ester Di-(Z-methoxy ethanol) ester Di-(2-ethoxy ethanol) ester Di-(Z-butoxy ethanol) ester, etc.

Esters of phosphonic acids are also prepared by reacting a phosphonyl chloride with a polyhydroxy alcohol according to the following equation:

R! I! (4) R P (CH-OH0):H] +2HO1 wherein R represents the hydrocarbon structure of the phosphonyl chloride, R and R" represent alkyl groups or hydrogen atoms and x represents a positive number having a value from 1 to 5.

Polyhydric alcohols and ethers of polyhydric alcohols which may be used in preparing esters according to the reaction of Equation 4 include ethylene glycol, diethylene glycol, triethylene glycol, a polyethylene glycol, 1,2-propane diol, dipropylene glycol, glycerol, 1,2-butane diol, 1,3-propane diol, 1,5-pentane diol, soybean oil monoglyceride, other fatty acid monoglycerides, erythritol, pentaerythritol, mannitol, sorbitol and substituted polyhydric alcohols such as pentoses, hexoses and polysaccharides.

Under certain conditions when polyhydroxy alcohols are used, cyclic esters are formed; but an excess of the polyhydroxy alcohol tends to prevent the formation of the cyclic ester.

The following examples further illustrate the preparation of those esters according to Equation 4.

Example XXIX.-Bis(Z-hydroxyethyl) dodecane phosphonate To a mixture of 1 part by weight of ethylene glycol and 1.7 parts by weight of pyridine was slowly added 1.6 parts by weight of dodecane phosphonyl chloride. After the mixture had been standing for minutes, it was heated on a steam bath for minutes. The resulting mixture was cooled to room temperature, then diluted with 1 part by weight of water. This diluted mixture was acidified with hydrochloric acid. The resulting upper oily phase was extracted with 20 grams of ethyl ether. The ether solution was washed with a saturated water solution of sodium sulfate, then dried. When the ether had been removed, the product was a light-colored oil having the formula:

01211251 (0 CHzCHZOH):

Example XXX-Soybean oil ester of cyclohexane phosphonic acid A mixture of 1.25 parts by weight of cyclohexane phosphonyl chloride and 2.5 parts by weight of carbon tetrachloride was placed in a flask equipped with a stirrer. During continued stirring, a mixture of 2.25 parts by weight of soybean oil monoglyceride and 1 part by weight of pyridine was added slowly. The whole mixture was heated at reflux temperature for about 6 hours, then washed free of pyridine and pyridine hydrochloride. The resulting product, a light yellow oil, contained 4.52% phosphorus.

New and valuable derivatives of phosphonyl chlorides and phosphonic acids may be obtained by reacting the phosphonyl chlorides or the phosphinic acids with alkylol amines. These new derivatives possess surface activity and are useful as wetting, emulsifying, dispersing and detersive agents. Types of derivatives which may be formed by the reaction of phosphonyl chlorides or phosphonic acids with alkylol amines include the amides (e. g., R-IFQIEROH),

and the cyclic amido esters 1 1 wherein R represents the hydrocarbon structure of the phosphonyl chloride or phosphonic acid and R represents the hydrocarbon group of the alkylol amines.

To illustrate the reaction of the phosphonyl chlorides with alkylol amines, the following specific examples are submitted:

Example XXXL-Reaction of monoisopropanolamine with tetradecane phosphonyl chloride To 16.5 parts by weight of monoisopropanolamine was added 16.2 parts by weight of tetradecane phosphonyl chloride. During this process of addition, the mixture was shaken and cooled. The whole mixture was warmed on a steam bath for 5 minutes, cooled, d luted with 10 parts by weight of water, and acidified with hydrochloric acid. The reaction product was extracted with 25 parts by weight of ether, washed wtih 40 parts of water, then dried. The resulting product was a tancolored, viscous liquid containing 7.70% phosphorus and 4.50% nitrogen.

Example XXXII.Reacti0n of diethanolamine with octadecane phosphonyl chloride To 23 parts by weight of diethanolamine was added 19 parts of octadecane phosphonyl chloride. During this process of addition, the mixture was shaken and cooled. The reaction product was obtained in the same manner as Example XXXI and contained 6.65% phosphorus.

Further products were obtained by reacting each one of the amines of Table I below with each one of the phosphonyl chlorides of Table II, obtaining l6 reaction products which were excellent wetting agents.

TABLE I.AMINES 1. Monoethanolamine 2. Diethanolamine 3. Monoisopropanolamine 4. Diisopropanolamine TABLE II.-PHOSPHONYL CHLORIDES 1. Dodecane phosphonyl chloride 2. Tetradecane phosphonyl chloride 3. Hexadecane phosphonyl chloride 4. Octadecane phosphonyl chloride Amides of phosphonyl chloride may be prepared by reacting a phosphonyl chloride with an amine. The following amides exemplify the amides which were prepared from dodecane phosphonyl chloride, tetradecane phosphonyl chloride and hexadecane phosphonyl chloride: di-(diethylene triamine) amide, di-(triethylene tetramine) amide, di-morpholine amide, di-guanidine amide, etc.

A number of amine salts of phosphonic acids are effective as antistripping agents in asphalt emulsions. These salts are prepared by reacting the phosphonic acids with amines, for example, ethanolamine, triethanolamine, monoethanolamine, amylamine, ammonium hydroxide, naphthylamine, aniline, cyclohexylamine, morpholine, polyamines containing 2 carbon atoms to polymers of polyalkylene polyamines containing 60 or more carbon atoms in the molecule, etc. Examples of polyamines are trimethylene diamine, pentamethylene diamine, tolylene diamine, histamine, methyl guanidine, guanidine, diethyltriamine, tetramethylene pentarnine, melamine, diquanide, urea, thiourea, decamethylene diamine, etc.

The following examples illustrate the reaction of phosphonic acids with amines to form salts:

Example XXXI1l.-Triethan0lamine salz 0f Octadecane phosphonic acid To an aqueous solution of 30 parts by weight of triethanolamine was added 33.4 parts by weight of octadecane phosphonic acid.

Other amine salts which were prepared include the di-(ethanolamine) salt of dodecane phosphonic acid, the di-(ethanolamine) salt of octadecane phosphonic acid, the di-(diethanolamine) salt of octadecane phosphonic acid, the di-(isopropanolamine) salt of dodedane phosphonic acid, the di-(isopropanolamine) salt of octadecane phosphonic acid, the di-(triethanolamine) salt of dodecane phosphonic acid, the di-(triethanolamine). salt of octadecane phosphonic acid, and the mono-(ethanolamine) salt of octadecane phosphonic acid.

We claim:

1. p-Bromophenylmethane phosphonyl chloride.

2. p-Chlorophenylmethane phosphonyl chloride.

16 References Cited in the file of this patent UNITED STATES PATENTS 2,071,017 Bass Feb. 16, 1937 5, 2,683,168 Jensen et a1. July 6, 1954 2,683,169 Jensen et al. July 6, 1954 OTHER REFERENCES Mellon. Comprehensive Treatise on Inorganic and 10 Theoretical Chemistry, vol. 8,. pgs. 1019 to 1020.

Jensen et al.: 71 I. A. C. S. 2384-5. 

1. P-BROMOPHENYLMETHANE PHOSPHONYL CHLORIDE. 